I just bought my 1989 240sx or S13 it has an sr20det redtop motor with a 5 speed transmission and it grinds a little bit. I was wondering what oil I should use and if I should mix different kinds of oils or what? I want to get rid of the grinding if someone could help that'd be nice. I mean I've looked it up and everything but I want to get some new input about it. Thanks.
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